Question

complete the orbital diagram for the element aluminum
blank orbital diagram
increasing energy
1s
2s
2p
3s
3p
4s
4p
5s
5p
6s
6p
7s
7p
6d
5d
4d
3d
5f
4f
fill in the lowest energy orbitals first!

Explanation:

Step1: Determine atomic number of aluminum

Aluminum has an atomic number of 13, so it has 13 electrons.

Step2: Fill orbitals according to Aufbau principle

Start with the lowest - energy 1s orbital. The 1s orbital can hold 2 electrons. Then fill the 2s orbital (2 electrons), then the 2p orbitals (6 electrons). After that, fill the 3s orbital (2 electrons). We have used 2 + 2+6 + 2=12 electrons so far. The remaining 1 electron goes into the 3p orbital.

Answer:

1s: $\uparrow\downarrow$
2s: $\uparrow\downarrow$
2p: $\uparrow\downarrow$ $\uparrow\downarrow$ $\uparrow\downarrow$
3s: $\uparrow\downarrow$
3p: $\uparrow$